Coffee A costs 75 cents per pound. It is mixed with Coffee B, which normally costs 80 cents per pound, to form a mixture that costs 78 cents per pound. If there are 10 pounds of the mix, how many pounds of Coffee A were used in the mix?
A. 3
B. 4
C. 4.5
D. 5
সঠিক উত্তরঃ
B.
4
Explanation:
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